Taizhou Fupusi Machinery Co.,Ltd.- John Tao
The stretching part of the bottle blowing equipment is installed inside the machine, and its direct acting parts are stretching rods arranged at equal intervals. In the original state, the stretching rod is below the fixed head shaft of the bottle embryo and is aligned with the center of the mold cavity. During the bottle blowing process, the stretching rod stretches quickly, enters the bottle embryo through the hole in the head shaft of the bottle embryo, and then pushes the top of the bottle embryo upward to help the bottle embryo expand and form evenly under the action of high-pressure air. Based on process requirements, the stretching rod must move quickly, position accurately, have low noise and low vibration, and the stroke and speed can be precisely adjusted according to the needs of different bottle types.
Replacement of stretching rod
Reasons for disassembly and assembly of stretching rod: 1. Change in the size of the tooth of the bottle embryo; 2. Change in the inner diameter of the bottle embryo; 3. Change in the size of the bottle or bottle shape.
Disassembly and adjustment steps of stretching rod: 1. Use the human-machine interface to move the stretching rod to the appropriate position; 2. Rotate the bolt to unscrew the stretching rod from the stretching rod connecting sleeve; 3. Remove the bottom screw of the stretching rod connecting sleeve and remove the stretching rod connecting sleeve; 4. Take out the stretching rod from top to bottom. The method of installing the stretching rod is the opposite.
Description of the cyclic motion process of the stretching part
- The mold is in the open mold state, and the sealing and stretching are both in the lower position. This is the initial state;
- After the preform is in place and the mold is closed, the sealing cylinder moves upward, and the front sealing ring is pressed against the lower end face of the preform head shaft to complete the sealing. This is the mold closing and sealing state;
- The sealing cylinder begins to pass high-pressure air into the preform, and at the same time the stretching servo or cylinder is started, the stretching rod rises to the preset height, the bottle body expands and forms, and the pressure in the bottle is maintained until it solidifies. This is the stretching and blowing state;
- The exhaust valve controls the exhaust, the sealing cylinder resets the mold to open, the stretching servo resets, and the stretching rod returns to the lower position. This is the open mold reset state. At this point, a cycle of motion is completed, the transmission system is activated, the finished bottle is moved out of the mold cavity, and the preform to be blown is sent into the mold cavity to enter the next action cycle.
Including stretching group, sealing group, blowing group
The stretching group uses a stretching cylinder or servo motor to move the stretching rod up and down.
The sealing group allows the teeth to maintain the same pressure inside and outside to prevent the teeth from deforming.
During pre-blowing, the blowing group injects low-pressure air while the stretch rod rises. After a period of pre-blowing, high-pressure air is injected to form the bottle.
The stretch rod of the fully automatic bottle blowing machine must be vertically centered with the mold nozzle, and a 1MM gap is reserved between the rod head and the bottom of the mold. The bottom of the stretch rod must be flush and there must be no height difference. The rod head is inserted into the middle of the bottom of the bottle mold, and the upper cylinder sealing head is inserted into the mouth of the bottle blank.